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Comet Wild 2

Comet Wild 2 is named after the scientist who discovered it. Paul Wild
is an astronomer from Switzerland who discovered the comet in January
1978. Wild 2 is
pronounced "Vilt 2".

The comet orbits the Sun once every
6.39 years, which is a pretty short time for a comet. Some comets take
more than 100 years to go around the
Sun one time! The comet's orbit is not a circle. Its orbit is shaped
more like an oval, which astronomers call an ellipse. When the comet
is at one end of the ellipse it is as close to the Sun as it gets. When
it is at the other end, it is far from the Sun. The orbit of Wild 2 brings
it a bit closer to the Sun than the planet Mars.
The orbit also swings the comet out beyond the orbit of Jupiter.

When we see a comet from Earth, we actually see the dust and gas the
comet gives off. The dust and gas form a fuzzy head called the "coma"
and tails that are thousands of kilometers (miles) long. The solid part
of a comet is called the nucleus, and is in the middle of the coma. The
nucleus of Wild 2 is only about five km (three miles) across.

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